The Hitachi ZAXIS Dash-3 Series excavators, including models ZX 70-3, 70LC-3, 70LCN-3, 75US-3, and 85US-3, represent a robust line of construction equipment designed for demanding tasks. These excavators are powered by reliable Isuzu diesel engines, offering efficient performance with net power typically ranging from 50-60 HP. Their hydrostatic transmission provides two travel speeds for versatile operation, while the hydraulic system features pilot controls and a variable displacement piston pump for precise maneuverability. With operating weights between approximately 7,000 and 8,500 kg, and overall widths of 2,200 to 2,300 mm, these machines are engineered for stability and productivity across a variety of job sites. This comprehensive full service repair and workshop manual provides detailed guidance for the Hitachi ZAXIS Dash-3 Series excavators. It covers essential maintenance procedures, including fluid capacities for engine oil and hydraulic systems, and outlines general service intervals. The manual offers extensive troubleshooting information, diagnostic procedures, and complete part lists, supported by detailed diagrams, illustrations, and wiring schematics. Technical data for systems such as the engine, transmission, hydraulics, electrical, and undercarriage are thoroughly documented. This resource is invaluable for owners, mechanics, and technicians seeking to maintain, repair, and optimize the performance and longevity of their Hitachi excavators.